General Information

Serial #

4722

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

METALS, INCLUDING LACQUERED BRASS; GLASS; SYNTHETICS

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

18.0 cm

Width

18.0 cm

Height

25.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Electricity

Sub-Category

N/A

Manufacturer

AKA

Cambridge

Country

England

State/Province

Unknown

City

Cambridge

Context

Country

Canada

State/Province

Ontario

Period

THIS INSTRUMENT PROBABLY USED C. 1900- 1930, AND POSSIBLY LATER.

Canada

PART OF A COLLECTION OF PHYSICS LABORATORY AND CLASSROOM DEMONSTRATION APPARATUS FROM MCMASTER UNIVERSITY. FOUNDED IN 1887, MCMASTER WAS ORIGINALLY A BAPTIST INSTITUTION, AND WAS LOCATED IN TORONTO. IN 1930 THE UNIVERSITY AND ITS STUDENT POPULATION OF 500 WAS MOVED TOHAMILTON, ONT. ( REF. 1)

Function

TO MEASURE ELECTRICAL CURRENT.

Technical

FAIRLY RARE EXAMPLE OF PARTICULAR TYPE OF CURRENT MEASURING APPARATUS. ANDRE BROCA (1862-1925) WAS A PROFESSOR AT L'ECOLE POLYTECHNIQUE IN PARIS: HE CREATED THIS DESIGN TO OVERCOME THE EFFECTS OF VARYING MAGNETIC FIELDS IN THE VICINITY OF THE METER. KNOWN AS THE "MOVING VERTICAL MAGNET TYPE" GALVANOMETER, MAGNETS WERE INCORPORATED IN SUCH A WAY AS TO INCREASE THE STRENGTH OF THE POLE ACTING ON THE CENTRE OF THE MOVING COIL. (REF. 1)

Area Notes

Unknown

Details

Markings

" 44 " incised in circular mounting located above viewing window. " THE CAMBRIDGE/ SCIENTIFIC INSTRUMENT CO. LTD./ CAMBRIDGE, ENGLAND/ NO. 4722 " incised on centre support.

Missing

APPEARS COMPLETE. From CA of 11/29/2001 by Matthew Bruce: No - appears complete

Finish

SOME BRIGHT LACQUERED SURFACES.

Decoration

N/A